Abandoned on Shura at fifteen by his father Akashachi after a failed invasion, Shachi survived through sheer determination, adapting to the island's brutality. His life changed upon meeting and falling in love with Leia. Inspired by her, he sought moral guidance and martial training under Jukei, mastering the diabolical Hokuto Ryuken. This art granted immense power at a spiritual cost, gradually transforming him into the feared "Rasetsu" (Rakshasa), a demon devouring other residents. To protect Leia from the pain of his potential demise, he deliberately drove her away, masking his intent with cruelty. Initially viewing Kenshiro's arrival as a chance to manipulate the Hokuto Shinken successor into eliminating rivals for his own control, Shachi's perspective shifted upon learning Hyou was Kenshiro's brother. Prioritizing family over ambition, he risked his life shielding Kenshiro and preventing conflict between the brothers, crucially revealing Hyou's true identity and motivations. After Hyou's recovery, Shachi reunited with Leia to guard the Taiseiden temple and its secret technique vital against Kaioh. When Kaioh attacked, Shachi fought relentlessly to protect both Leia and the secret. Mortally wounded, his unwavering resolve awakened the spirits of Hokuto's noble founders, whose spectral force repelled Kaioh, allowing Shachi to safeguard his cherished ones before succumbing. His combat centered on Hokuto Ryuken, emphasizing rapid, close-range strikes amplified by destructive energy. Key techniques included Hama Dokushi (Rupturing Grinding Solitary Finger), emitting energy bursts from a finger; Katsuhagan (Shriek-Grabbing Jab), a crushing hand motion generating massive blasts; and Rasetsu Tenkai (Rakshasa's Fury), a relentless combo ending in a powerful kick. He relied on aggressive positioning and exploiting openings in close combat.